| Singles | |
|---|---|
| 2021 Thoreau Tennis Open | |
| Champion |  Magdalena Fręch |
| Runner-up |  Renata Zarazúa |
| Score | 6–3, 7–6(7–4) |
Caroline Dolehide was the defending champion, having won the previous edition in 2019. [1] She lost in the second round to Katrina Scott.
Magdalena Fręch won the title, defeating Renata Zarazúa in the final, 6–3, 7–6(7–4).
Alison Van Uytvanck (withdrew)
Hsieh Su-wei (quarterfinals)
Madison Brengle (semifinals)
Vera Zvonareva (semifinals) Lauren Davis (first round) Christina McHale (first round) Greet Minnen (second round) Renata Zarazúa (final)
Storm Sanders (second round)| Semifinals | Final | ||||||||||||
| Magdalena Fręch | 7 | 6 | |||||||||||
| 4 | Vera Zvonareva | 5 | 3 | ||||||||||
| Magdalena Fręch | 6 | 77 | |||||||||||
| 8 | Renata Zarazúa | 3 | 64 | ||||||||||
| 3 | Madison Brengle | 6 | 4 | 2 | |||||||||
| 8 | Renata Zarazúa | 2 | 6 | 6 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 9 | S Sanders | 6 | 6 | ||||||||||||||||||||||||
| WC | A Parks | 2 | 4 | 9 | S Sanders | 3 | 2 | ||||||||||||||||||||
| PR |  R Marino | 3 | 64 | M Fręch | 6 | 6 | |||||||||||||||||||||
| M Fręch | 6 | 77 | M Fręch | 6 | 4 | 7 | |||||||||||||||||||||
| C Dolehide | 6 | 6 | WC | K Scott | 4 | 6 | 5 | ||||||||||||||||||||
| Q | R Anderson | 3 | 4 | C Dolehide | 6 | 0 | 5 | ||||||||||||||||||||
| WC | K Scott | 77 | 7 | WC | K Scott | 1 | 6 | 7 | |||||||||||||||||||
| 5 | L Davis | 61 | 5 | M Fręch | 7 | 6 | |||||||||||||||||||||
| 4 | V Zvonareva | 6 | 6 | 4 | V Zvonareva | 5 | 3 | ||||||||||||||||||||
| Q | E-s Liang | 1 | 2 | 4 | V Zvonareva | 6 | 6 | ||||||||||||||||||||
 T Maria | 0 | 3 | V Lepchenko | 3 | 4 | ||||||||||||||||||||||
| V Lepchenko | 6 | 6 | 4 | V Zvonareva | 5 | 6 | 6 | ||||||||||||||||||||
| Q |  M Bolkvadze | 6 | 3 | 6 | Q | M Bolkvadze | 7 | 2 | 4 | ||||||||||||||||||
| Q | V Duval | 2 | 6 | 1 | Q | M Bolkvadze | 6 | 6 | |||||||||||||||||||
 L Küng | 4 | 1 | 7 | G Minnen | 4 | 4 | |||||||||||||||||||||
| 7 | G Minnen | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | C McHale | 4 | 3 | ||||||||||||||||||||||||
 C Bucșa | 6 | 6 | C Bucșa | 6 | 6 | ||||||||||||||||||||||
| UM Arconada | 713 | 2 | 6 | UM Arconada | 3 | 3 | |||||||||||||||||||||
| J Loeb | 611 | 6 | 4 | C Bucșa | 3 | 5 | |||||||||||||||||||||
| WC | L Sun | 6 | 6 | 3 | M Brengle | 6 | 7 | ||||||||||||||||||||
 K Nara | 1 | 3 | WC | L Sun | 1 | 77 | 2 | ||||||||||||||||||||
| M Inglis | 3 | 0r | 3 | M Brengle | 6 | 65 | 6 | ||||||||||||||||||||
| 3 | M Brengle | 6 | 3 | 3 | M Brengle | 6 | 4 | 2 | |||||||||||||||||||
| 8 | R Zarazúa | 65 | 6 | 6 | 8 | R Zarazúa | 2 | 6 | 6 | ||||||||||||||||||
| LL | A Glatch | 77 | 2 | 3 | 8 | R Zarazúa | 6 | 6 | |||||||||||||||||||
| WC | S Whittle | 63 | 1 | G Min | 1 | 3 | |||||||||||||||||||||
| G Min | 77 | 6 | 8 | R Zarazúa | 6 | 2 | 7 | ||||||||||||||||||||
| L Cabrera | 4 | 6 | 4 | 2 | S-w Hsieh | 3 | 6 | 5 | |||||||||||||||||||
 B Haddad Maia | 6 | 3 | 6 | B Haddad Maia | 3 | 1 | |||||||||||||||||||||
 A Raina | 2 | 2 | 2 | S-w Hsieh | 6 | 6 | |||||||||||||||||||||
| 2 | S-w Hsieh | 6 | 6 | ||||||||||||||||||||||||
Mariam Bolkvadze (qualified) Beatriz Haddad Maia (moved to main draw)
Kateryna Bondarenko (first round) Robin Anderson (qualified) Mona Barthel (first round) Whitney Osuigwe (first round)
Samantha Murray Sharan (qualifying competition) Liang En-shuo (qualified)| First round | Qualifying competition | ||||||||||||
| 1 | Mariam Bolkvadze | 6 | 6 | ||||||||||
| PR |  Peangtarn Plipuech | 2 | 4 | ||||||||||
| 1 | Mariam Bolkvadze | 6 | 6 | ||||||||||
| Sophie Chang | 2 | 1 | |||||||||||
| Sophie Chang | 6 | 6 | |||||||||||
| 5 | Mona Barthel | 2 | 3 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| Alt | Eden Silva | 2 | 6 | 1 | |||||||||
| Victoria Duval | 6 | 4 | 6 | ||||||||||
| Victoria Duval | 7 | 6 | |||||||||||
| 7/PR | Samantha Murray Sharan | 5 | 4 | ||||||||||
| WC | Brittany Collens | 5 | 0 | ||||||||||
| 7/PR | Samantha Murray Sharan | 7 | 6 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 3 | Kateryna Bondarenko | 7 | 4 | 5 | |||||||||
| Alexa Glatch | 5 | 6 | 7 | ||||||||||
| Alexa Glatch | 6 | 2 | 3 | ||||||||||
| 8/PR | Liang En-shuo | 3 | 6 | 6 | |||||||||
| Hsu Chieh-yu | 1 | 6 | 2 | ||||||||||
| 8/PR | Liang En-shuo | 6 | 4 | 6 | |||||||||
| First round | Qualifying competition | ||||||||||||
| 4 | Robin Anderson | 7 | 6 | ||||||||||
| Catherine Harrison | 5 | 1 | |||||||||||
| 4 | Robin Anderson | 6 | 6 | ||||||||||
| WC | Victoria Hu | 4 | 3 | ||||||||||
| WC | Victoria Hu | 6 | 6 | ||||||||||
| 6 | Whitney Osuigwe | 4 | 2 | ||||||||||
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